Valves and valve actuation – Electrically actuated valve – Rotary electric actuator
Reexamination Certificate
2006-04-18
2006-04-18
Bastianelli, John (Department: 3751)
Valves and valve actuation
Electrically actuated valve
Rotary electric actuator
C251S286000
Reexamination Certificate
active
07028979
ABSTRACT:
A servo-assisted butterfly valve comprising a valve body, a valve seat formed in the valve body, a butterfly disc adapted to engage the valve seat, a shaft on which the butterfly disc is keyed, an electric motor coupled to the shaft by means of at least one toothed wheel provided with a projection, a spiral return spring adapted to rotate the butterfly disc towards the closed position, and an opposing spring adapted to rotate the butterfly disc towards a limp-home position defined by an abutment body against the action of the return spring; the opposing spring is a flat leaf spring and is mounted on a moving member which is mounted coaxially and idly on the shaft and comprises a projection adapted to engage in abutment against the abutment body, a first end of the opposing spring being free and adapted to come into contact with the projection of the toothed wheel during the rotation of this toothed wheel.
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Search Report for European Application No. EP 04 10 4443 (Dec. 8, 2004).
Bastianelli John
Magneti Marelli Powertrain S.p.A.
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